The research on the dynamics of hydrocarbon accumulation is a frontier of kinetics research.The study on the dynamics of hydrocarbon accumulation in the large Chunxiao oil and gas field is also a hot topic

but a bottleneck as well

in the study of hydrocarbon accumulation features in the East China Sea Shelf Basin for a long time.Through well-to-seismic tie interpretation and numerical simulation

we concluded three energy fields supporting the accumulation in the oil and gas field

including temperature field

pressure field and stress field

the dynamic elements of which were analyzed as well.It's pointed out that the study area is characterized by high geothermal gradient

up to 36~40℃/km

and 60 magmatic intrusive rocks are found therein

leading to the promotion of hydrocarbon accumulation by locally increasing temperature.The thermal maturity of source rocks is significantly inconsistent.The results of numerical simulation show that the maturity is high in degreein northeast and southeast of large Chunxiao area;the Tianwaitian and Chunxiao-Duanqiao structures come to the last in terms of the maturity of their source rocks

and the large Chunxiao structure is also late in this aspect;the NNE-trending tension stress field in the early and middle stages produces tensile normal faults

which are conducive to hydrocarbon migration and preservation.In the later period

the NWW-trending tension-shear stress field forms translational faults

which are also favorable for hydrocarbon preservation.Typical overpressure is developed and a large overpressure sac exists in the area

and an overpressure-pressure sac model is proposed to demonstrate the effect of overpressure and fracture systems on promoting hydrocarbon migration.In addition

the numerical simulation method is used to reveal the era

process and results of hydrocarbon migration.The key moment and events

and dynamic mechanism and process of hydrocarbon accumulation in the study area are integratedly analyzed

leading to the establishment of the dynamic model of hydrocarbon accumulation in large Chunxiao oil and gas field as well as its accumulation model.